All these new students will be divided ________ 12 classes. Then these classes will be divided ________ the teachers.
Did you ask whose computer ______________ ?
If you ____ your money ____ mine, we will have enough to buy one more set of stamps to ____our collection.
It was only with the help of the local guide ______.
---Is this book interesting? ---Yes, but I’m sure it won’t interest __________.
We should consider what use can be made ______ such a material(材料).